According to one embodiment, a sheet binding device includes a tape support base, a slide base, a tape holder, a first displacement mechanism, and a second displacement mechanism. The tape support base supports a tape. The slide base is movable in a first direction. The tape holder is supported on the slide base and is movable in a second direction crossing the first direction. The first displacement mechanism displaces the tape holder in a second direction from a first position that is a position away from the tape to a second position at which the tape holder is capable of coming into contact with the tape. The second displacement mechanism displaces the tape holder in the second direction from the second position to the first position.

A post-processing apparatus for an image forming apparatus includes a processing tray on which a sheet bundle is placed for discharging onto a discharge tray, a detector configured to detect presence or absence of the sheet bundle on the processing tray, and a controller. The controller is configured to control driving of the processing tray to discharge the sheet bundle onto the discharge tray and to determine whether or not to output an error if a detection result of the detector after the processing tray has been driven to discharge the sheet bundle onto the discharge tray indicates presence of the sheet bundle. The controller outputs the error if the sheet bundle is not a last sheet bundle of a post-processing job and does not output the error if the sheet bundle is the last sheet bundle of the post-processing job.

According to one embodiment, a sheet binding device includes a tape support base, a slide base, a tape holder, a first displacement mechanism, and a second displacement mechanism. The tape support base supports a tape. The slide base is movable in a first direction. The tape holder is supported on the slide base and is movable in a second direction crossing the first direction. The first displacement mechanism displaces the tape holder in a second direction from a first position that is a position away from the tape to a second position at which the tape holder is capable of coming into contact with the tape. The second displacement mechanism displaces the tape holder in the second direction from the second position to the first position.

Provided is a recording material processing apparatus including: a first binding processing unit that is provided to be capable of moving on a predetermined movement route and is configured to perform a binding process on a recording material; and a second binding processing unit that is installed on the predetermined movement route, is configured to perform the binding process on the recording material, and is configured to withdraw from the movement route by receiving force from the first binding processing unit which moves along the movement route.

A post-processing apparatus for an image forming apparatus includes a processing tray on which a sheet bundle is placed for discharging onto a discharge tray, a detector configured to detect presence or absence of the sheet bundle on the processing tray, and a controller. The controller is configured to control driving of the processing tray to discharge the sheet bundle onto the discharge tray and to determine whether or not to output an error if a detection result of the detector after the processing tray has been driven to discharge the sheet bundle onto the discharge tray indicates presence of the sheet bundle. The controller outputs the error if the sheet bundle is not a last sheet bundle of a post-processing job and does not output the error if the sheet bundle is the last sheet bundle of the post-processing job.

A sheet processing apparatus performs a binding discharge process and a sorting discharge process. In the sorting discharge process, a second operation is repeatedly performed to form an unbound first sheet bundle on the stacking portion, and a third operation is repeatedly performed to form an unbound second sheet bundle on the stacking portion. In the second operation, a sheet conveyed in a first conveyance direction is nipped by a pair of alignment plates without conveying the sheet in a second conveyance direction, and a shift operation of moving a position of the sheet in a shift direction is performed. Then the sheet is discharged to a shift position on the stacking portion. In the third operation, the sheet is discharged to a position displaced from the shift position on the stacking portion without conveying the sheet in the second conveyance direction.

A media processing apparatus includes a slit insertable a sheet bundle of multiple sheets, a sheet-bundle holder, a liquid applier, a press binder, and a controller. The sheet-bundle holder holds the sheet bundle and detects the thickness of the sheet bundle. The liquid applier applies liquid to the sheet bundle. The press binder presses and binds the sheet bundle to perform press-binding process. The controller causes the sheet-bundle holder to hold the sheet bundle and detect the thickness of the sheet bundle, determines whether to cause the liquid applier to apply liquid to the sheet bundle based on the thickness of the sheet bundle, causes the liquid applier to apply the liquid to the sheet bundle when it is determined that the thickness of the sheet bundle is equal or larger than a prescribed thickness, and causes the press binder to press and bind the sheet bundle.

A post-processing device includes a stacking portion on which a medium having an image recorded thereon is stacked; an aligning portion that is disposed on the stacking portion and that aligns a position of an edge of the medium; a drawing member that draws the medium stacked on the stacking portion toward the aligning portion; and a guiding member that is disposed above the drawing member and that guides the medium that is transported toward the stacking portion, the guiding member including a vicinity portion that is in a vicinity of the drawing member and that is recessed so as to receive the drawing member.

A sheet ejection device includes an ejection roller pair, a stacking tray, a protrusion member and a movement mechanism. The protrusion member is supported to be able to reciprocate between a protrusion position and a retraction position in a predetermined movement direction. The movement mechanism includes: a rotation shaft; a holding member; and a rack and pinion mechanism which includes a pinion gear and a rack gear. In at least a part of the rack gear in the movement direction, a narrow width region is provided which includes a narrow width gear and a cutout portion. In the narrow width region, the pinion gear is slidable between a meshing position and a release position, and in a state where the pinion gear has slid to the release position, the protrusion member can be relatively moved with respect to the pinion gear in the movement direction.

A post-processing device includes a stacking portion on which a medium having an image recorded thereon is stacked; an aligning portion that is disposed on the stacking portion and that aligns a position of an edge of the medium; a drawing member that draws the medium stacked on the stacking portion toward the aligning portion; and a guiding member that is disposed above the drawing member and that guides the medium that is transported toward the stacking portion, the guiding member including a vicinity portion that is in a vicinity of the drawing member and that is recessed so as to receive the drawing member.